Mo@Pt core–shell nanoparticles as an efficient electrocatalyst for oxygen reduction reaction

Dai, Yu; Sun, Kai; Li, Yong

doi:10.1016/j.jelechem.2015.09.020

Cited by 17 publications

(11 citation statements)

References 39 publications

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“…Notably, Pt NDs-F and Pt NDs-Cl provide high surface areas despite their relatively large overall particle size due to their porous and branched structure, which are not vulnerable to aggregation. This result is in consistence with previous reports related to either porous Pt or Pt-based catalysts 42 43 44 45 48 53 54 55 56 57 58 59 60 .…”

Section: Resultssupporting

confidence: 92%

“…7a ). This is suggesting the delayed formation and weakening of Pt-oxygenated species onto porous nanodendrites relative to Pt/C, a desired feature for a good ORR catalyst in agreement with reports elsewhere 20 41 42 43 44 45 46 47 48 49 50 51 52 . The electrochemically active surface areas (ECSAs) of Pt NDs-F (25 m 2 g −1 Pt ) and Pt NDs-Cl (22 m 2 g −1 Pt ) are about 59 and 52% of the Pt/C (42 m 2 g −1 Pt ).…”

Section: Resultssupporting

confidence: 90%

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Gaseous NH3 Confers Porous Pt Nanodendrites Assisted by Halides

Eid

et al. 2016

Sci Rep

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Tailoring the morphology of Pt nanocrystals (NCs) is of great concern for their enhancement in catalytic activity and durability. In this article, a novel synthetic strategy is developed to selectively prepare porous dendritic Pt NCs with different structures for oxygen reduction reaction (ORR) assisted by NH3 gas and halides (F−, Cl−, Br−). The NH3 gas plays critical roles on tuning the morphology. Previously, H2 and CO gas are reported to assist the shape control of metallic nanocrystals. This is the first demonstration that NH3 gas assists the Pt anisotropic growth. The halides also play important role in the synthetic strategy to regulate the formation of Pt NCs. As-made porous dendritic Pt NCs, especially when NH4F is used as a regulating reagent, show superior catalytic activity for ORR compared with commercial Pt/C catalyst and other previously reported Pt-based NCs.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 90%

Gaseous NH3 Confers Porous Pt Nanodendrites Assisted by Halides

Eid

et al. 2016

Sci Rep

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“…Besides, Mo is used by biological systems mainly for its oxidative and reducing properties [33]. Additionally, it is used as a catalyst for desulfurization and denitrogenating processes in the petrochemical industry [34]. Molybdenum is an element with a "d" band characteristic in its electronic configuration.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Pt-Mo/WMCNTs Nanostructures Reduced by the Green Chemical Route and Its Electrocatalytic Activity in the ORR

Torres-Santillan¹,

Capula-Colindres²,

Teran³

et al. 2023

Carbon Nanotubes - Recent Advances, New Perspectives and Potential Applications

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Platinum (Pt) and molybdenum (Mo) nanoparticles were supported on multiwall carbon nanotubes (MWCNTs) by a green chemical route. Different relations of Pt:Mo (10:0, 8:2, 5:5, 2:8, and 0:10, respectively) in weight percent were compared to their electrocatalytic activity in the oxygen reduction reaction (ORR) in an acid medium. The morphologies and the structure were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The rotary disc electrode (RDE) and linear voltammetry (LV) techniques were employed to observe the electron transfer and mass transport phenomena. The surface activation of the samples was conducted by cyclic voltammetry (CV) technique According to the TEM analysis. The TEM analysis, shows that Mo and Pt nanoparticles have a good dispersion on the tubular carbon support, with sizes between 3.94 and 10.97 nm. All Pt-containing ratios had exhibited a first-order transfer in the ORR without inhibition of the reaction. Molybdenum is a reducing agent (oxyphilic metal) that benefits the adsorption of oxygenated species. The Pt:Mo 8:2 wt.% ratio presents the maximum benefits in the kinetic parameters. The Mo10/MWCNTs nanostructure inhibits the ORR due to the strong bonds it presents with oxygen. Molybdenum at low concentrations with platinum is conducive to oxygen molecule adsorption-desorption by increasing the ORR’s electroactivity.

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“…In recent decades, significant efforts have been devoted to overcoming these limitations. − Among them, developing Pt alloy materials that are cost-effective and highly active owing to their unique electronic structure, in some cases even more active than pure Pt metal, is regarded as the most attractive research field. − The vast majority of studies on Pt alloys have mainly focused on certain ligand effects that downshift the Pt d-band center to enhance the catalytic activity for the ORR. − Most studies have focused on alloying Pt with 3d transition metals (e.g., Co, Ni, and Cu). ,,, Stamenkovic et al showed that a crystalline Pt 3 Ni(111) surface exhibits high ORR activity owing to the weakening of the interaction between Pt and nonreactive oxygenated species . However, these 3d transition metals are susceptible to acidic media, which adversely affects their long-term operating performances. , However, it has been reported that 4d or 5d transition metals, such as Mo or W, exhibit better tolerance than the former in acidic media, resulting in consistent ORR performances …”

Section: Introductionmentioning

confidence: 99%

Gas-Phase Synthesis of PtMo Alloy Electrocatalysts with Enhanced Activity and Durability for Oxygen Reduction Reaction

Hyun-seok

Song

et al. 2022

ACS Sustainable Chem. Eng.

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The proton-exchange membrane fuel cell is a promising technology to effectively utilize hydrogen energy, which is the ideal alternative to fossil fuels. However, the high dependency on scarce Pt as an oxygen reduction reaction (ORR) electrocatalyst is still a severe barrier that hinders widespread commercialization. Herein, we propose a facile synthetic strategy facilitating mass production of Pt–Mo solid-solution alloy nanoparticles on a carbon support (PtMo/C) as a highly active ORR electrocatalyst. Without using organic surfactants or reducing agents, our synthesis process based on the gas-phase method in an inert atmosphere is cost-effective and does not require any post-treatment, unlike most reported solution-based reduction processes. Both molybdenum metal and carbon monoxide decomposed from molybdenum hexacarbonyl contribute to the reduction of the PtMo alloy during the annealing process. By elucidating the growth and synthesis mechanisms, we optimized the particle size of PtMo/C to approximately 3.1 nm, annealed at 800 °C (PtMo/C-800). Consequently, PtMo/C-800 shows high mass activity (146 mA mgPt –1), which is superior to that of commercial Pt/C, and excellent durability after accelerated degradation tests.

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Mo@Pt core–shell nanoparticles as an efficient electrocatalyst for oxygen reduction reaction

Cited by 17 publications

References 39 publications

Gaseous NH3 Confers Porous Pt Nanodendrites Assisted by Halides

Gaseous NH3 Confers Porous Pt Nanodendrites Assisted by Halides

Synthesis of Pt-Mo/WMCNTs Nanostructures Reduced by the Green Chemical Route and Its Electrocatalytic Activity in the ORR

Gas-Phase Synthesis of PtMo Alloy Electrocatalysts with Enhanced Activity and Durability for Oxygen Reduction Reaction

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